*SPOILER: PONTIFICATION ZONE FOLLOWS*
I believe that matter has its roots in mind, rather than the other way around... or maybe better put, matter is just the outward manifestation of mind. The brain is kind of like a radio, "picking up" patterns of thought that are already there, on whatever frequency it happens to be tuned to at the time. Most people stay on the same channel for most of their adult lives. It's possible to change this station-- for better or worse-- and some people do this consciously or unconsciously. The interesting thing is that these inner changes in frequency always seem to manifest themselves in outward material circumstances. To some people this is magic, others see it as karma or luck or Divine Providence, whatever you call it though the result is the same. I'm not aware of anybody who has observed this phenomenon and really understands how it works-- the important thing is that the principles involved seem to hold true for most people, most of the time.
From time to time you see vestiges of these ideas remaining in language. On one hand, for example, 'concentration' refers to a narrowing of one's mental focus; on another, 'concentration' is an indication of relative strength, density, or frequency. Then you have a related word, 'concentric,' implying a spiral which narrows and narrows as you get closer towards the center-- and where the lines of the circle get closer and denser together. All of these ideas are related somehow, in a very primal way that oddly transcends the literal meaning of the spoken words.
If mind is the source of matter, and if dreaming is a mental state which is somewhat detatched from material reality, it may follow that dreams are an especially 'concentrated' form of mentation. Accepting all of the above, then, it stands to reason that conscious control of one's dream-state is either a cause or an effect of greater conscious control of one's material circumstances. This is an idea that the Western Mysteries share with traditional shamanism, although the two schools split on the issue of cause/effect.
I've never practiced Neuro-Linguistic Programming (NLP) but I understand that it also teaches several techniques for lucid dreaming.
*LONG RAMBLY SERMON TERMINATED*